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We present the mass excesses of 59-64Cr, obtained from recent time-of-flightnuclear mass measurements at the National Superconducting Cyclotron Laboratoryat Michigan State University. The mass of 64Cr is determined for the firsttime, with an atomic mass excess of -33.48(44) MeV. We find a significantlydifferent two-neutron separation energy S2n trend for neutron-rich isotopes ofchromium, removing the previously observed enhancement in binding at N=38.Additionally, we extend the S2n trend for chromium to N=40, revealing behaviorconsistent with the previously identified island of inversion in this region.We compare our results to state-of-the-art shell-model calculations performedwith a modified Lenzi-Nowacki-Poves-Sieja interaction in the fp shell,including the g9/2 and d5/2 orbits for the neutron valence space. We employ ourresult for the mass of 64Cr in accreted neutron star crust network calculationsand find a reduction in the strength and depth of electron-capture heating fromthe A=64 isobaric chain, resulting in a cooler than expected accreted neutronstar crust. This reduced heating is found to be due to the >1-MeV reduction inbinding for 64Cr with respect to values from commonly used global mass models.

Time-of-flight mass measurements of neutron-rich chromium isotopes up to N = 40 and implications for the accreted neutron star crust